峰前卸荷损伤白砂岩三轴压缩及巴西劈裂试验研究  

Triaxial Compression and Brazilian Splitting Test of White Sandstone with Pre-peak Unloading Damage

作　　者：纪沛志 郭隆仁 刘坤 梁忠豪 秦楠[1] JI Peizhi;GUO Longren;LIU Kun;LIANG Zhonghao;QIN Nan(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061)

机构地区：[1]青岛科技大学机电工程学院,青岛266061

出　　处：《计算机与数字工程》2025年第3期877-881,900,共6页Computer & Digital Engineering

基　　金：山东省自然科学基金项目(编号:ZR2021QE202);矿山灾害预防控制教育部重点实验室开放研究基金项目(编号:MDPC201915)资助。

摘　　要：为研究白砂岩在不同峰前卸荷损伤条件下的三轴抗压强度和单轴抗拉强度的变化情况,对白砂岩采用轴压和围压同时卸载的方式来制备不同卸荷损伤的试件,然后再对其分别进行三轴压缩再承载试验和巴西劈裂试验,通过Origin软件进行数据处理,分析白砂岩的再承载力学性能以及抗拉强度随峰前卸荷损伤的变化规律。结果发现:峰前卸荷损伤程度越大,白砂岩三轴抗压强度越低,其中在σu=80%时下降幅度最大,而最小抗拉强度出现在σu=90%时。In order to study the change of triaxial compressive strength and uniaxial tensile strength of white sandstone under different pre-peak unloading damage conditions,the simultaneous unloading method of axial and confining pressure is used to prepare different unloading damages for white sandstone.Then,the triaxial compression reloading test and the Brazilian splitting test are carried out respectively,and the data is processed by the Origin software to analyze the reloading mechanical properties of white sandstone and the change law of tensile strength with pre-peak unloading damage.The results show that the greater the damage degree of unloading before the peak,the lower the triaxial compressive strength of white sandstone.The decrease range is the largest whenσu=80%,and the minimum tensile strength appears whenσu=90%.

关 键 词：峰前卸荷损伤 白砂岩 三轴压缩再承载 巴西劈裂 

分 类 号：TU45[建筑科学—岩土工程]